Siward Biornsson Earl von Northumberland 
Siward Biornsson Earl was born about 1012 in Of, Denmark.1 Siward Biornsson Earl's father was Biorn (Bjorn) Ulsiusson (Estridsen). His paternal grandparents were Ulf Thorgilsson and Estrid Svendsdatter Prinzessin von Daenemark. He was an only child. He died in 1055 in York, Yorkshire, England.1 
Details of Siward Biornsson Earl's family with Aelfled (Elfleda) von Bernicia
Details of Siward Biornsson Earl's family with Godiva
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